Dynamic magnetic information storage or retrieval – Head mounting – For moving head into/out of transducing position
Reexamination Certificate
1999-07-26
2001-11-13
Davis, David (Department: 2652)
Dynamic magnetic information storage or retrieval
Head mounting
For moving head into/out of transducing position
Reexamination Certificate
active
06317295
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a magnetic head device in which magnetic heads are slidably brought into contact with a flexible disc to read data from the disc or write data into the disc, and more particularly a magnetic head device in which the disc can be held stably by an upper magnetic head and a lower magnetic head.
2. Description of the Related Art
FIG. 7
is a side view for showing a magnetic head device
50
of the prior art.
The magnetic head device
50
shown in
FIG. 7
is used in a low capacity type floppy disc device and as medium in this case a flexible disc is used.
In the aforesaid magnetic disc device
50
shown in
FIG. 7
, a supporting member
52
is arranged on a chassis
51
. The aforesaid supporting member
52
is inserted into and guided by a guide shaft (not shown) which is arranged to face toward a radial direction of a disc D. There is also provided a driving section not shown, the supporting member
52
is guided on the guide shaft under a driving force of the driving section and moved toward a radial direction of the disc D.
A fixed arm
53
extending from the bottom part of the supporting member
52
toward the disc D is integrally formed with the supporting member
52
, the fixed arm
53
can be slid at the lower surface side of the disc D, and there is provided a magnetic head
58
of a side
0
at an upper surface of the extremity end of the fixed arm
53
.
In addition, the supporting member
52
is provided with a supporting arm
54
at a position opposite to the fixed arm
53
, the base end of the supporting arm
54
is connected to a leaf spring
55
and the base end of the leaf spring
55
is fixed to the supporting member
52
by a screw
57
. Further, the extremity end of the supporting arm
54
is provided with a magnetic head
59
of the side
1
at a position opposite to the magnetic head
58
.
The leaf spring
55
is provided with a helical coil spring
56
at its upper part and the supporting arm
54
is always biased by the helical coil spring
56
toward the direction of the disc D. Additionally, this magnetic head device
50
is provided with a retracting mechanism (not shown) for retracting the magnetic head
59
above the disc D when the disc D is not loaded.
However, as a high density (a high volume) of the disc D was required, the disc D had to be rotated while its rotating speed was increased more than that of the prior art, resulting in that the prior art magnetic head device
50
had the following problem.
That is, in the case of the magnetic head device
50
, the motion of the magnetic head
58
at the side
0
in its direction of height is restricted. Due to this fact, when the disc D is rotated at a high speed, if there is a certain difference between an access plane of the disc D and the magnetic heads
58
,
59
in a direction of height, a strain may occur at the disc D by its own inertia. With such an arrangement as above, the magnetic heads
58
,
59
could not follow the deformation of the disc D, resulting in that there was a possibility that a certain off-track state was produced, reading-in or writing-in of data into the disc failed or the disc D was damaged.
In view of the foregoing, the magnetic head device
60
as shown in
FIG. 8
has been provided in which the magnetic head can follow against the deformation of the disc D.
The magnetic head device
60
shown in
FIG. 8
is a mechanism in which each of both upper and lower magnetic heads
64
,
65
at the side
0
and at the side
1
in respect to the supporting member
61
is supported by each of leaf spring arms
62
,
63
, respectively. In the magnetic head device
60
shown in
FIG. 8
, if the disc D is rotated at a high speed, it becomes possible to cause the magnetic heads
64
,
65
to follow the disc D.
On the contrary, since the upper and lower magnetic heads
64
,
65
are supported together by the leaf spring arms
62
,
63
, press contacted points of the magnetic heads
64
,
65
with the disc D may easily be displaced in their positions in either upward or downward direction in respect to an installing reference position of the disc D due to an unbalanced biasing force of each of the upper and lower arms
62
,
63
.
When the press contacted points of the upper and lower magnetic heads
64
,
65
with the disc D are displaced in an upward or downward direction in respect to the disc D, any one of the magnetic heads is forcedly brought into contact with a recording surface of the disc D, an excessive frictional force is imparted upon the recording surface of the disc D or the magnetic heads. The result is that the recording surface of the disc or the sliding surface of each of the magnetic heads may easily be damaged.
Further, the disc is also deformed, the leaf spring arms
62
,
63
for supporting the magnetic heads
64
,
65
under repelling force attained from the deformation may easily be deformed under a specified period, resulting in that the arms
62
,
63
and the magnetic heads
64
,
65
may easily generate vibration S.
In the case that an amplitude of this vibration S is high, a displacement is generated between the disc D and each of the magnetic heads
64
,
65
in respect to the radial direction of the disc D (a track direction), resulting in that an off-track state may easily be produced.
In reference to the foregoing arrangement, in the case of the magnetic head device
60
above, the resilient forces of the arms
62
,
63
supporting the magnetic heads
64
,
65
are measured individually and it becomes necessary to select each of the arms
62
,
63
and combine them in such a way that the resilient forces of the upper and lower arms
62
,
63
may be well balanced and its manufacturing work becomes quite complicated.
SUMMARY OF THE INVENTION
The present invention has been completed in order to solve the aforesaid problems found in the prior art and it is an object of the present invention to provide a magnetic head device in which a balance in a height direction of an upper magnetic head and a lower magnetic head can be easily adjusted, a vibration of each of the magnetic heads in its height direction can be easily adjusted, a vibration of each of the magnetic heads in its height direction can be absorbed and then an occurrence of an off-track state can be prevented.
The present invention provides a magnetic head device comprised of a flexible disc; magnetic heads arranged at both surfaces of the disc so as to perform either a recording or a reproducing of data while the magnetic heads are being slidably contacted with the disc surfaces; a pair of arms capable of being moved up and down, supporting each of the aforesaid magnetic heads at their extremity ends and realizing a biasing force for resiliently pressing the magnetic heads against the disc; and a supporting member for supporting the base ends of the arms characterized in that there is provided adjusting means in which at least one of the arms is pushed to adjust a height of the arm in its vertical direction.
The arrangement of the adjustment means described above enables a relative height between the press contacting points of the upper and lower magnetic heads and the disc to be easily adjusted, eliminates a necessity for performing a selective combination of the upper and lower arms, enables any optional extracted component parts to be assembled and used, enables a useless application of the component parts to be eliminated and also attains its cost-down. In addition, it becomes possible to manufacture the device in a short period of time and it can be adapted for various kinds of media.
Although the arms are formed by metallic or resin leaf springs, the arms are formed by a rigid member, their base ends are supported by the leaf springs, the magnetic heads are biased against the disc by resilient forces of the leaf springs or the rigid arms are biased by a helical coil spring or the like arranged outside the arms and both the upper magnetic head and the lower magnetic head are resiliently brought into contact with the d
Alps Electric Co. ,Ltd.
Brinks Hofer Gilson & Lione
Davis David
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